The intense rivalry between Karasuno and Shiratorizawa in the anime "Haikyuu!!" leads to heightened emotions and motivation for both teams, pushing them to perform at their best. It also creates a tense and exciting atmosphere during their matches, keeping viewers on the edge of their seats. Additionally, the rivalry drives character development as players on both teams strive to outdo each other and grow stronger. Ultimately, the consequences of this rivalry result in intense and thrilling volleyball matches that showcase the dedication and passion of the players.